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Income group 2015 1975 1960 1947 Lowest fifth, 0.2 0.032 0.044 0.048 0.051 Second fifth, 0.4 0.115 0.149 0.17 0.169 Third fifth, 0.6 0.259

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Income group 2015 1975 1960 1947 Lowest fifth, 0.2 0.032 0.044 0.048 0.051 Second fifth, 0.4 0.115 0.149 0.17 0.169 Third fifth, 0.6 0.259 0.32 0.348 0.336 Fourth fifth, 0.8 0.49 0.568 0.588 0.568 Highest fifth, 1 1.00 1.00 1.00 1.00 a.) Using a quadratic regression equation to find the Lorenz curve for the year 1975. b.) Find the Gini index for the Lorenz curve you found in part a.

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